<html>
<title>welcome</title>
<body>
<h4>单元格跨行跨列:</h4>   <!--标题-->
<table border="1" width="500px" cellspacing="10">
    <tr>
        <th align="left">表头(左对齐)</th>
        <th align="center">表头(居中)</th>
        <th align="right">表头(右对齐)</th>
    </tr>
    <tr>
        <td>行1，列1</td>
        <td>行1，列2</td>
        <td>行1，列3</td>
    </tr>
    <tr>
        <td colspan="2" align="center">合并行单元格</td>
        <td>行2，列3</td>
    </tr>
    <tr>
        <td rowspan="2" align="center">合并列单元格</td>
        <td>行3，列2</td>
        <td>行3，列3</td>
    </tr>
    <tr>
        <td>行4，列2</td>
        <td>行4，列3</td>
    </tr>
</table>

</body>
</html>